Mitsubishi Colt Ralliart. Manual - part 67

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-222

STEP 13. Check harness between B-26 (terminal
No. 6) accelerator pedal position sensor
connector and A-08 (terminal No. 88) engine-ECU
connector or engine-CVT-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES :

Go to Step 14 .

NO :

Repair the damaged harness wire.

STEP 14. Replace the accelerator pedal
assembly.

• After replacing the accelerator pedal assembly,

re-check the trouble symptoms.

Q: Is the check result normal?

YES :

Check end.

NO :

Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.

AK203205

6 5 4 3 2

Connector: B-26

B-26 (B)

B-26 Harness side
connector

AK402725

100

101

102

103

104

105

106

115

116

117

118

119

120

121

107

108

109

110

111

112

113

114

130

131

132

133

134

135

136

122

123

124

125

126

127

128

129

72 71

74 73

76 75

A-08

Connector:

A-08

Harness side connector

Battery

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-223

Code No. P2226: Barometric Pressure Sensor System

FUNCTION

• The barometric pressure sensor converts the bar-

ometric pressure into a voltage signal and inputs
the signal to the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.

• In response to the signal, the engine-ECU <M/T>

or engine-CVT-ECU <CVT> corrects the fuel
injection amount, etc.

TROUBLE JUDGMENT

Check Conditions

• 2 seconds later after the ignition switch has been

in ON position or the engine has started up.

• The battery voltage is 8 V or more.

Judgment Criteria

• The sensor output voltage is 4.5 V or more (Baro-

metric pressure of above 114 kPa or equivalent)
for 4 seconds.

• The sensor output voltage is 0.2 V or less (Baro-

metric pressure of below 5 kPa or equivalent) for
4 seconds.

PROBABLE CAUSE

• Failed barometric pressure sensor

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES :

Replace engine-ECU <M/T> or

engine-CVT-ECU <CVT>.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-13

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-224

Code No. U1073: Bus Off

CAUTION

If diagnosis code U1073 is output from
engine-ECU <M/T> or engine-CVT-ECU <CVT>,
surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the
communication circuits are normal.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position <M/T>.

• All the time <CVT>

Judgment Criterion

• When the buss off error is detected.

COMMENT ON TROUBLE SYMPTOM

• The failure is possibly caused by malfunction of

the harness and connector in CAN busline or by
malfunction in engine-ECU <M/T> or
engine-CVT-ECU <CVT>.

PROBABLE CAUSES

• Failed harness and connector in CAN busline

• Failed engine-ECU <M/T> or engine-CVT-ECU

<CVT>

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnosis

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Correct CAN busline (Refer to 54D

−

Diagnosis

− Can Bus Diagnosis Table

P.54D-13

), and then go to Step 3 .

STEP 2. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis code is output

from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Replace engine-ECU <M/T> or

engine-CVT-ECU <CVT>, then go to Step 3
.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-13

STEP 3. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis code is output

from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Go to Step 1 .

NO :

Check end.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-225

Code No. U1102: ABS-ECU Time-out

CAUTION

If diagnosis code U1102 is output from
engine-ECU <M/T> or engine-CVT-ECU <CVT>,
surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the
communication circuits are normal.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in "ON" position <M/T>.

• While the cranking switch is in OFF position, or

when 3 seconds pass after the cranking switch is
in OFF from ON.

• The battery voltage is 10 V or more.

Judgment Criterion

• The signals cannot be received from ABS-ECU

through CAN busline.

COMMENT ON TROUBLE SYMPTOM

• Current malfunction

The failure is possibly caused by malfunction of the

harness and connector in CAN busline between
engine-ECU <M/T> or engine-CVT-ECU <CVT>
and ABS-ECU, by malfunction in the power sup-
ply system of ABS-ECU, in ABS-ECU itself, in
engine-ECU <M/T> or engine-CVT-ECU <CVT>.

• Past malfunction

Focus on diagnosing malfunction of the harness and

connector in CAN busline between engine-ECU
<M/T> or engine-CVT-ECU <CVT> and
ABS-ECU as well as malfunction in the power
supply system of ABS-ECU (Refer to GROUP 00
− How to Use Troubleshooting/Inspection Service
Points

− How to Cope with Intermittent Malfunc-

tions

P.00-13

NOTE: In case of Past malfunction, M.U.T.-III CAN

bus diagnosis cannot detect the failure even if
there is malfunction in CAN bus, so that check
CAN busline in the same way as Intermittent mal-
function (Refer to GROUP 00

−

How to Use Trou-

bleshooting/Inspection Service Points

−

How to

Cope with Intermittent Malfunctions

P.00-13

The diagnosis codes being output to each ECU
with CAN communication can narrow down the
most suspected area. (Refer to GROUP54D

−

Diagnosis

−

CAN Bus Diagnosis Table

P.54D-13

PROBABLE CAUSES

• Failed harness and connector in CAN busline

• Failed engine-ECU <M/T> or engine-CVT-ECU

<CVT>

• Failed ABS-ECU

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnosis

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Correct CAN busline (Refer to GROUP54D
− Diagnosis − CAN Bus Diagnosis Table

P.54D-13

), and then go to Step 6 .

STEP 2. M.U.T.-III other system diagnosis codes

• Confirm whether the diagnosis codes are output

from ABS-ECU.

Q: Is the diagnosis code set?

YES :

Perform the troubleshooting of ABS (Refer

to GROUP 35B

− Check Chart For

Diagnosis Codes

P.35B-7

NO :

Go to Step 3 .

STEP 3. M.U.T.-III other system diagnosis codes
Confirm whether Diagnosis Code U1102: ABS-ECU
time-out is output from the following ECU having
CAN communication with ABS-ECU

• EPS-ECU

• Combination meter-ECU

Q: Is the diagnosis code set?

YES :

Go to Step 4 .

NO :

Go to Step 5 .

Main

Index

Group

TOC

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